//
// Created by zhangrongxiang on 2017/10/12 12:51
// File server
//

#include <stdio.h>
#include <unistd.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <string.h>

#define BUFSIZE 1024

int main(int argc, char *argv[]) {
    int server_sockfd;//服务器端套接字
    int client_sockfd;//客户端套接字
    int len;
    struct sockaddr_in my_addr;   //服务器网络地址结构体
    struct sockaddr_in remote_addr; //客户端网络地址结构体
    int sin_size;
    char buf[BUFSIZE];  //数据传送的缓冲区
    memset(&my_addr, 0, sizeof(my_addr)); //数据初始化--清零
    my_addr.sin_family = AF_INET; //设置为IP通信
    my_addr.sin_addr.s_addr = INADDR_ANY;//服务器IP地址--允许连接到所有本地地址上
    my_addr.sin_port = htons(8000); //服务器端口号

    /*创建服务器端套接字--IPv4协议，面向连接通信，TCP协议*/
    if ((server_sockfd = socket(PF_INET, SOCK_STREAM, 0)) < 0) {
        perror("socket");
        return 1;
    }

    /*将套接字绑定到服务器的网络地址上*/
    if (bind(server_sockfd, (struct sockaddr *) &my_addr, sizeof(struct sockaddr)) < 0) {
        perror("bind");
        return 1;
    }

    /*监听连接请求--监听队列长度为5*/
    listen(server_sockfd, 5);

    sin_size = sizeof(struct sockaddr_in);

    /*等待客户端连接请求到达*/
    if ((client_sockfd = accept(server_sockfd, (struct sockaddr *) &remote_addr, &sin_size)) < 0) {
        perror("accept");
        return 1;
    }
    printf("accept client %s\n", inet_ntoa(remote_addr.sin_addr));
    len = send(client_sockfd, "Welcome to my server\n", 21, 0);//发送欢迎信息

    char str[100] = {0};
    /*接收客户端的数据并将其发送给客户端--recv返回接收到的字节数，send返回发送的字节数*/
    while ((len = recv(client_sockfd, buf, BUFSIZE, 0)) > 0) {
        buf[len] = '\0';
        printf("client say: %s\n", buf);
        printf("Enter string to send:");
        scanf("%s", str);
        if (send(client_sockfd, str, len, 0) < 0) {
            perror("write");
            return 1;
        }
    }
    close(client_sockfd);
    close(server_sockfd);
    return 0;
}